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ShareWare OnLine Volume 2 (CMS Software)(1993).iso
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LIBRARY.TXT
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1992-03-23
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So you've never used a library before and you want to know what
gives?
A library is a collection of routines, whether written in
BASIC, assembly language, or some other language altogether.
It provides a convenient way to allow different programs to use
the same sets of standard or special-purpose routines
(subprograms or functions, in BASIC parlance).
There are two forms of libraries for QuickBASIC. The form with
the extension ".LIB" is for use with LINK, for creating
stand-alone programs which do not require the QuickBASIC
environment. This sort of library can be made or manipulated
using the LIB utility provided with QuickBASIC. The form of
library with the extension ".QLB" is for use in the QuickBASIC
environment. It is created with LINK and (unfortunately) can't
be manipulated at all.
To use a QLB library, you specify the /L parameter when
starting up QB:
QB /L PBCLONE
You can optionally include the name of your program before the
/L switch.
To use a LIB library, you specify the name of the library when
you LINK your program. Either let LINK prompt you for the
library or type something like this:
BC program/O; (or whatever)
LINK program/EX,,NUL,PBCLONE
If you are in the QuickBASIC environment and direct the
compiler to produce an .EXE file, it will automatically link
the library for you if you started up QB with the /L option.
Suppose you have more than one library that you wish to use?
Well, provided that you have both of the libraries in .LIB
form, this presents no problem. To create a combined .LIB
library, use the LIB utility to extract all of the .OBJ files
from one .LIB and add them to the other one. You can convert
the new combined library to .QLB form by using a special LINK
syntax:
LINK combined.LIB/Q/SE:1024,,NUL,BQLB45;
The last two digits of "BQLBxx" represent the version of the
compiler that you have. It doesn't necessarily match the
formal version number, though, so you might just want to use
DIR and see what the name of the file really is. BQLBxx.LIB is
one of the files that comes with QuickBASIC. If you have QBX,
use QBXQLB instead of BQLBxx.
The "/SE:1024" part is only needed when dealing with large
libraries, such as PBClone. It tells LINK to allocate more
space for its internal tables. This doesn't affect the size of
the resulting library, though, so it never hurts to use this
parameter.
If you experience a LINK error, make sure that you're using the
current version of LINK. I've heard from many people who turn
out to have the wrong version of LINK in their PATH
somewhere... when LINK starts up, it will display its version
number on the screen. The version should be around 3.69 as of
QuickBASIC 4.5, or 5.05 for QBX. You must use the LINK that
came with QuickBASIC-- the one that comes with Quick C is
incompatible and the one that came with BASCOM 6.0 (the one
with two periods in the version number) has a few bugs.
If you are using BASCOM 7.0, DO NOT interrupt LINK with a Break
or Control-C, as this may cause it to damage your hard disk!!!
This bug is known to appear in the LINK that comes with BASCOM
7.0. I'm not sure whether they fixed it in BASCOM 7.1. You
may be more familiar with BASCOM 7.x as "PDS" or "The
Professional Development System" (Marketing, ugh).
All clear? No?! Check your BASIC manuals for more information!